GB/T 343342017 (GB/T343342017, GBT 343342017, GBT343342017) & related versions
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Test method of mirror shape for solar collector

GB/T 343342017
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GBT 343342017

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GB/T 343342017: PDF in English (GBT 343342017) GB/T 343342017 GB NATIONAL STANDARD OF THE PEOPLE’S REPUBLIC OF CHINA ICS 81.040.30 Q 34 Test method of mirror shape for solar collector ISSUED ON. OCTOBER 14, 2017 IMPLEMENTED ON. SEPTEMBER 1, 2018 Issued by. General Administration of Quality Supervision, Inspection and Quarantine; Standardization Administration Committee. Table of Contents Foreword . 3 1 Scope .. 4 2 Terms and definitions .. 4 3 Symbols.. 5 4 Test principle .. 6 5 Instruments .. 6 6 Testing process .. 11 7 Parameter calculation .. 11 8 Test report .. 18 Foreword This Standard was drafted in accordance with the rules given in GB/T 1.12009. This Standard was proposed by China Federation of Building Materials. This Standard shall be under the jurisdiction of National Technical Committee on Industrial Glass and Special Glass of Standardization Administration of China (SAC/TC 447). The drafting organizations of this Standard. Beijing Aobotai Technology Co., Ltd., China Building Materials Inspection & Certification Group Co., Ltd., China Haiyang Energy Group Co., Ltd., China Guangdong Nuclear Power Development Co., Ltd. Main drafters of this Standard. Bo Cong, Wang Jingjing, Zhang Zhemin, Li Menglei, Wang Shanshan, Lu Jun, Zhang Yuxia, Yuan Jing, Wang Dong, Qiu Juan, Li Boye, Li Yang, Wang Lichuang, Yang Fan, Feng Tian, Fu Lu, Zhu Xiaowei, Zhang Ji, Yang Hui, Qi Bin. Test method of mirror shape for solar collector 1 Scope This Standard specifies the terms and definitions, symbols, test principle, instruments, test procedures, parameter calculation and test report of mirror shape for solar collector based on stripe reflection principle. This Standard is applicable to the tests of mirror shape for slot, dish, tower solar collectors. 2 Terms and definitions For the purposes of this document, the following terms and definitions apply. 2.1 height deviation height deviation in the reference direction between the actual mirror and the ideal mirror 2.2 slope the tangent of the angle between the tangent plane and the reference plane at a point on the reflector 2.3 slope deviation the angle between the actual mirror normal and the ideal mirror normal at a point on the mirror 2.4 focus deviation under use conditions, the distance from the reflected light to the mirror's ideal focus or focal line 2.5 focus deviation distribution the distribution of focus point deviation of the mirror on the reference plane 2.6 parallel ray intercept factor parallel light rays evenly distributed along the ideal direction of incidence, the ratio of the amount of light reflected by the mirror to the heat sink to the amount of light incident on the mirror 2.7 sun intercept factor the ratio of the amount of sunlight reflected in the ideal direction of incidence to the heat sink by the mirror TO the amount of light incident on the mirror 2.8 intercept factor distribution take the diameter of the heatabsorbing device as the abscissa, the actual mirrorparallel lightcutting factor of the corresponding caliber as the ordinate, form the distribution curve of the parallel lightcutting factor under different caliber conditions 2.9 concentrating quality factor the ratio of the area under the actual mirror parallel light cutoff factor distribution curve TO the area under the ideal mirror parallel light cutoff factor distribution curve with a use aperture of the heatabsorbing device as the boundary condition of the parallel light cutoff factor distribution curve 3 Symbols The following symbols apply to this document. CQF. concentrating quality factor FDx. mean square root of focus deviation in xaxis direction in the use coordinate system (xyz) fdx (X, Y). focus deviation distribution in Xaxis direction in the measurement coordinate system (XYZ) FDy. mean square root of focus deviation in yaxis direction in the use coordinate system (xyz) fdy (X, Y). focus deviation distribution in Yaxis direction in the measurement coordinate system (XYZ) HD. mean square root of height deviation in the measurement coordinate system (XYZ) hd (X, Y). mirror height deviation distribution in the measurement coordinate system (XYZ) IC. parallel ray intercept factor ICsun. sun intercept factor RIC(φ). parallel ray intercept factor distribution of heat absorption device g (X, Y)  the slope at some fixed point (X, Y) on the tested mirror; its modulus value is calculated according to equation (4). 5.2.4 Obtain mirror shape parameters 5.2.4.1 According to the mirror shape obtained from the measurement coordinate system, the following parameters can be calculated. height deviation distribution hd(X, Y), mean square root of height deviation HD, slope deviation distribution sdX(X, Y) in the X axis direction, slope deviation distribution sdY(X, Y) in the Y axis direction, mean square root of slope deviation in Xaxis direction SDX, mean square root of slope deviation in Yaxis direction SDY, focus deviation distribution in Xaxis direction fdX (X, Y), focus deviation distribution in Xaxis direction fdY (X, Y). 5.2.4.2 Convert the slope distribution gx (X, Y), gy (X, Y) in the measurement coordinate system XYZ to the slope distribution gx (x, y), gy (x, y) in the use coordinate system xyz according to the use requirements. In the use coordinate system xyz, the zaxis is the direction of the ideal incident light, the yaxis is the mirror bus direction, and the xaxis is the vertical yoz plane direction. Use linear interpolation or area projection weighing methods, in the use coordinate system xyz plane, according to the parameter calculation requirements, form an equal interval slope distribution. Combined with the sun divergence angle and the diameter of the heat collector, the following parameters can be calculated. mean square root of focus deviation in xaxis direction FDx, mean square root of focus deviation in yaxis direction FDy, parallel ray intercept factor IC, sun intercept factor ICsun, parallel ray intercept factor distribution of heat absorption device RIC(φ), concentrating quality factor CQF. 5.3 Requirements 5.3.1 Sample bench The sample bench shall satisfy the positioning installation of the tested sample. The sample positioning accuracy shall be less than 1mm. 5.3.2 Graphic generator The graphic generator can be implemented by a display or projection method that can generate a dynamic pattern. The display area shall meet the complete reflective mirror test of the tested sample. sdX  the slope deviation of the surface test point of the test sample in the X axis direction, in milliradians (mrad); β'X  the angle between the projection direction of the test point's measured normal on the XOZ plane and the Zaxis, in milliradians (mrad); βX  the angle between the projection direction of the test point's ideal normal on the XOZ plane and the Z axis, in milliradians (mrad). See equation (8) for the calculation of the mean square root of slope deviation of the tested sample SDX in Xaxis direction. where, SDX  the mean square root of slope deviation of the tested sample, in milliradians (mrad); sdxi  the slope deviation of a certain test point on the surface of the test sample in the direction of the Xaxis direction, in milliradians (mrad); n  total number of test points. The slope deviation distribution sdX (X, Y) in the Xaxis direction is the distribution of the slope deviation of each test point on the sample surface on the XOY coordinate plane sdXi, represented in twodimensional error map. 7.2.2 Mean square root of slope deviation in Yaxis direction SDY In the measurement coordinate system, the slope deviation of the test point on the tested sample surface in Yaxis direction sdY is equal to the angle between the actual normal direction and the ideal normal direction of the test point on the YOZ projection plane. See equation (9) for the calculation. where, sdY  the slope deviation of the test point on the tested sample surface in Yaxis direction, in milliradians (mrad); β'Y  the angle between the actual measured normal of test point on the projection direction of YOZ and the Zaxis, in milliradians (mrad); 7.3.3 Mean square root of focus deviation in yaxis direction FDy See equation (13) for the calculation of focus deviation fdY in the Y direction. where, fdY  the focus deviation of the test point on the tested sample surface along with the Y direction, in millimeters (mm); sdY  the slope deviation of the test point on the tested sample surface in the Y direction, in milliradians (mrad); L  the distance from the test point on the tested sample surface to the ideal focus or focal line, in millimeters (mm). Convert the measurement coordinate system to use coordinate system. Interpolation and other methods can be used to achieve uniform light sampling and obtain the focus deviation fdY in the use coordinate system. The mean square root of focus deviation in yaxis direction FDy is calculated according to equation (14). where, FDy  the mean square root of focus deviation of tested sample in the yaxis direction; fdYi  the focus deviation of a test point on the tested sample surface along with the Y direction; m  total number of data points. Use XOY plane as reference plane. The focus deviation distribution on the Y axis direction fdY (X, Y) is the distribution of the focus deviation of each test point on the sample surface on the XOY coordinate plane fdYi, represented in twodimensional error map. 7.4 Intercept factor calculation 7.4.1 Calculation principle The intercept factor can be calculated by ray tracing simulation, and the number ......
Standard ID  GB/T 343342017 (GB/T343342017)  Description (Translated English)  Test method of mirror shape for solar collector  Sector / Industry  National Standard (Recommended)  Classification of Chinese Standard  Q34  Classification of International Standard  81.040.30  Word Count Estimation  14,157  Date of Issue  20171014  Date of Implementation  20180901  Drafting Organization  Beijing Aobo Tai Technology Co., Ltd., China Building Materials Inspection and Certification Group Co., Ltd., Haiyang Energy Group Co., Ltd., China Guangdong Nuclear Power Development Co., Ltd.  Administrative Organization  National Industrial Glass and Special Glass Standardization Technical Committee (SAC/TC 447)  Proposing organization  China Building Materials Federation  Issuing agency(ies)  General Administration of Quality Supervision, Inspection and Quarantine of PRC; China National Standardization Administration 
